“We spent today trying different chassis setups,” said Barbosa, winner of the 2010 Rolex 24 for Action Express. “We definitely have a lot of work to do, but we improved with every session and it’s definitely working better than it did here last January. We’ve got plenty of room to improve, but we’re heading in the right direction.”

Wednesday’s conclusion of testing will be the final official Grand-Am activity prior to the Roar Before the Rolex 24, Jan. 4-6. The 2013 season opens with the 51st Rolex 24 At Daytona on Jan. 26-27.

Faced with a steep learning curve on his first visit to Daytona Beach, Frank Biela was up to the task. The five-time overall winner of the 24 Hours of Le Mans ran a quick lap of 1:48.953 (117.629 mph) in the No. 52 Audi of America Audi R8 to lead the GT competitors.

“Very impressive,” Biela said of Daytona. “It was a strange feeling with the banking at first, but I quickly started enjoying it. We’re still in discussion about our plans for 2013, but I’d like to do not only the Rolex 24, but we’re talking about doing the whole season.”

Boris Said was second in the No. 31 Whelen Engineering Corvette co-driven by Eric Curran, 1:49.160 (117.406 mph), followed by Patrick Long in the No. 73 Park Place Motorsports Porsche GT3 co-driven by Patrick Lindsey and Jason Hart, 1:49.782 (116.740 mph).

Joining the test for Tuesday only was Martin Plowman, driving the No. 37 Conquest Endurance Morgan/Nissan. The American Le Mans Series regular took advantage of the prime opportunity to gather data, which will be analyzed as a first step towards a merger of the two sanctioning bodies into one organization for 2014 competition.

“We knew coming into the test that today was not about comparisons, it was purely to give the tire guys some indication of how our cars work, in the exact same conditions as the Rolex Series cars on track,” Plowman said. “It was a brand new tire for us, and we had to work very hard to get the setup right. I was very happy with how they worked. By the end of the morning, we were very happy with it. During the afternoon, we did a full race stint simulation. We were hoping for a qualifying simulation, but miscalculated our fuel. Other than that, we ticked every box that we wanted to do.

“Daytona is one of the iconic tracks, and just to be out there is a huge honor – especially on the road course,” added the 25-year-old Englishman. “The chicane is very fast, and it takes a lot of commitment to be fast through there. With this car, you can really go deep through the corner there and challenge it.”

The test concludes Wednesday, with three sessions beginning at 9 a.m. and running through 5 p.m.